RFI: mtree -n option

(Apologies if this is not the correct forum - I'm not sure who is
responsible for mtree)
At the moment, if I merely want to see the differences between two
directory trees or compare to an mtree spec I can't tell mtree not to
make any modifications to it. I can tell it not to update permissions
and attributes with the -W flag, but mtree still insists on creating
missing directories.
For example, assuming the following directory trees:
new
new/blah
new/foo/
old
old/bar/
old/blah
old/foo/empty
old/blah and new/blah differ in their content, so MD5 checks will fail
If I want to compare these, I'd run the following:
tiu[/data/scratch] 134v>: mtree -c -p old -K md5 | mtree -Wu -p new -K md5
blah: md5 (0x5149d403009a139c7e085405ef762e1a,
0x3d709e89c8ce201e3c928eb917989aef)
missing: ./bar (created)
missing: ./foo/empty
... but then mtree will have created new/bar for me, as above.
So, can we add a "don't to anything" option to mtree? -n appears to be
available and would match expected behaviour for other tools ...
Regards,
Malcolm
--
Malcolm Herbert This brain intentionally
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